feat: searching for nullifiers and tags concurrently

Author: benesjan

yarn-project/pxe/src/contract_function_simulator/oracle/utility_execution_oracle.ts

@@ -350,10 +350,16 @@ export class UtilityExecutionOracle implements IMiscOracle, IUtilityExecutionOra
       this.jobId,
     );
 
-    await logService.syncTaggedLogs(this.contractAddress, pendingTaggedLogArrayBaseSlot, this.scopes);
-
     const noteService = new NoteService(this.noteStore, this.aztecNode, this.anchorBlockStore);
-    await noteService.syncNoteNullifiers(this.contractAddress);
+
+    // The following being parallelized is fine for multiple reasons:
+    // 1. syncTaggedLogs doesn't write to note store - it just stores the pending tagged logs in a capsule array, which
+    //    is then processed in Noir once this handler returns.
+    // 2. even if syncTaggedLogs did write to note store, it would not result in inconsistent state.
+    await Promise.all([
+      logService.syncTaggedLogs(this.contractAddress, pendingTaggedLogArrayBaseSlot, this.scopes),
+      noteService.syncNoteNullifiers(this.contractAddress),
+    ]);
   }
 
   /**